Synthesis of diverse analogues of Oenostacin and their antibacterial activities☆

Several diverse analogues of Oenostacin, a naturally occurring potent antibacterial phenolic acid derivative, have been synthesized. A small library with more than forty analogues having different aromatic rings and varied side chains has been achieved through solution phase synthesis. Some of these analogues, that is, 22 , 23 and 42 , possessed potent antibacterial activities against Staphylococcus epidermidis and Staphylococcus aureus having EC 50 ranging from 0.49 to 0.67 μM as compared to Oenostacin (EC 50 = 0.12 μM).